[ASAN] Use regex for addresses in kernel_area.cc test

This test was failing on mips because mips addresses are 40-bit long.
Using regex for address solves this issue.

Reviewers: dsanders, kcc, samsonov
Subscribers: llvm-commits, mohit.bhakkad, jaydeep
Differential Revision: http://reviews.llvm.org/D9516

llvm-svn: 236844